Please help wanna ride tomorrow

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So I bought the parts I need for my rm250. I need tires and my crf 450r has new tires and excelrims. As soon as my 250 is ridable my 450 is Goin sumo. My rims and tires are soon to be useless can I use them on my rm? I mounted them up and seem to be fine Ie; centered and breaks slide into calipers fine other things I'm missing why they won't work?